Explore the triangle area formula, its derivation, and practical examples to master this essential geometric concept effortlessly.

Learn how to calculate the areas of rectangle, triangle, and circle in Excel for a single cell or range of cells usin this formula.

A demonstration of how to calculate the perimeter and area of simple and compound shapes with the help of the crow and Detective Stinker.

Any triangle has between one and three lines that bisect both the area and the perimeter. We determine the conditions for each possible number. The College Mathematics Journal emphasizes the first two ...

Extra: The puzzle presented in this activity is called a “perimeter magic triangle of order three.” To extend it to a higher-order perimeter magic triangle start by drawing a new triangle.

The outside edge of a shape is known as the perimeter. Learn how to work out the perimeter of a 2D shape with this Year 4 article from BBC Bitesize.

This feature originally appeared on the site for the NOVA program Infinite Secrets. More on the method Archimedes' method finds an approximation of pi by determining the length of the perimeter of ...